Abstract
High angular resolution (0.07″) observations of the water masers in the circumstellar shells of the supergiant stars VY CMa and VX Sgr and four M giant stars (IK Tau, RT Vir, W Hya, and RX Boo) are presented. For all these sources, the standard spherically symmetric expanding shell model fails to fit the water maser data as well as it fits 1612 MHz OH maser data. A component of radial outflow appears to be present in the H 2 O shells of three stars (RT Vir, IK Tau, VX Sgr)
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